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FOREWORD

This document provides information to pavement researchers on the data collected in the Long-Term Pavement Performance Information Management System (LTPP IMS). It describes the type and format of the data collected, includes guidelines for requesting data, and provides examples of the reports generated from the data.

The Data Users Reference Manual is for pavement engineers and researchers involved in the study of comprehensive data to improve design, maintenance, and rehabilitation of pavements.

This document supersedes the Long-Term Pavement Peiformance Information Management
System: Data Users Guide published in July 1993. It accompanies the seventh release of IMS
data and will be superseded at the time of the eighth release.

The Federal Highway Administration (FHWA) has distributed this document primarily in
electronic form. Copies are being sent to FHWA regional apd division offices, Strategic
Highway Research Program Coordinators, and all data users. A copy can be found through
the LTPP web page at http://www.tfurc.gov/pavement/ltpp/ltpphome.htm by selecting the
LTPP Data Base button.

Charles J. Nemmers P.E., Director

Office of Engineering, Research and Development

Notice

This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. This report does not constitute a standard, specification, or regulation.

The United States Government does not endorse products or manufacturers. Trade and manufacturers' names appear in this report only because they are considered essential to the object of the document.